Elon Musk became the world's first trillionaire this week.

Elon Musk's trillionaire status is based on his ownership of real assets like Twitter, Tesla, and about half of SpaceX, rather than cash in a bank.

Traders value SpaceX at approximately $2 trillion, making Elon Musk's half-ownership worth nearly a trillion dollars.

Elon Musk's net worth is $850 billion, making him the richest person who has ever lived, adjusted for everything.